21604552292 has 12 divisors (see below), whose sum is σ = 37814907900. Its totient is φ = 10800292896.

The previous prime is 21604552247. The next prime is 21604552373. The reversal of 21604552292 is 29225540612.

It can be written as a sum of positive squares in 2 ways, for example, as 21592539136 + 12013156 = 146944^2 + 3466^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 471167 + ... + 514982.

It is an arithmetic number, because the mean of its divisors is an integer number (3151242325).

Almost surely, 2^21604552292 is an apocalyptic number.

It is an amenable number.

21604552292 is a deficient number, since it is larger than the sum of its proper divisors (16210355608).

21604552292 is a wasteful number, since it uses less digits than its factorization.

21604552292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991630 (or 991628 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 38.

The spelling of 21604552292 in words is "twenty-one billion, six hundred four million, five hundred fifty-two thousand, two hundred ninety-two".